(1) A state bank may invest in fixed assets of the bank or the stock or obligations of any corporation holding such fixed assets or may make loans to or upon the security of the stock of any such corporation, but the aggregate of all such investments and loans shall not exceed one hundred percent of the bank's capital, as provided in the rules promulgated by the banking board; except that the banking board may approve a larger investment upon application of the bank if the banking board deems the same prudent. As used in this subsection (1), "fixed assets" means real estate, leasehold improvements, fixtures, furniture, and equipment; "real estate" and "leasehold improvements" include land and buildings to be used in the transaction of the bank's business and any excess space that may be rented to others.
(2) The rate of depreciation of property so acquired may be prescribed by the banking board.